Missoula County

Home permits and project costs in Missoula, MT

Missoula sits in Missoula County, Montana. Snow load, hail and deep freeze-thaw cycling drive roofing, insulation and exterior envelope specifications well above Sun Belt minimums. Work outside city limits is permitted by the county building department rather than the city.

Model reviewed August 2026

Local cost index

+0%

vs national average

Permit fee index

-12%

vs national baseline

Population

77,757

Homeownership

Do you need a permit in Missoula?

For most structural work, yes

Missoula enforces montana residential code, based on the irc, where adopted locally through Missoula County. Roofing, electrical, plumbing, structural, pools and most exterior additions require a permit and inspection. Cosmetic work — paint, flooring, cabinet swaps — generally does not.

Project costs in Missoula

National baselines adjusted by the local labor and materials index.

Project	Typical cost	Permit	Deep pages
Roof Replacement	$9,600 – $32,500	required	Cost·Permit
AC Replacement	$5,300 – $15,700	required	Cost·Permit
Fence Installation	$2,400 – $11,100	usually required	Cost·Permit
Water Heater Replacement	$1,200 – $5,500	required	Cost·Permit
Pool Installation	$38,500 – $116,400	required	Cost·Permit
Window Replacement	$7,600 – $34,500	required	Cost·Permit
Electrical Panel Replacement	$1,900 – $6,900	required	Cost·Permit
Generator Installation	$6,600 – $22,200	required	Cost·Permit
Solar Panel Installation	$15,200 – $48,700	required	Cost·Permit
Kitchen Remodel	$18,200 – $92,900	conditional	Cost·Permit
Bathroom Remodel	$9,100 – $42,400	conditional	Cost·Permit
Driveway Replacement	$4,200 – $19,200	usually required	Cost·Permit
Paver Patio & Walkway	$3,500 – $16,100	conditional	Cost·Permit
Deck Construction	$5,600 – $28,300	required	Cost·Permit
Shed Installation	$1,800 – $12,100	conditional	Cost·Permit
Whole-House Repipe	$4,500 – $16,100	required	Cost·Permit
EV Charger Installation	$800 – $4,200	required	Cost·Permit
Hurricane Shutter Installation	$3,200 – $18,300	required	Cost·Permit
Pool Enclosure / Screen Cage	$9,100 – $42,500	required	Cost·Permit
Septic System Replacement	$7,600 – $28,400	required	Cost·Permit
Impact Window Installation	$9,200 – $42,700	required	Cost·Permit
Exterior Door Replacement	$900 – $6,600	usually required	Cost·Permit
Garage Door Replacement	$1,400 – $7,600	required	Cost·Permit
Siding Installation	$8,100 – $38,400	usually required	Cost·Permit
Stucco Repair	$900 – $16,100	conditional	Cost·Permit
Soffit & Fascia Replacement	$1,800 – $11,100	conditional	Cost·Permit
Gutter Installation	$900 – $6,600	rarely required	Cost·Permit
Roof Repair	$400 – $4,800	conditional	Cost·Permit
Flat Roof Replacement	$6,100 – $28,400	required	Cost·Permit
Attic Insulation	$1,200 – $7,600	rarely required	Cost·Permit
Ductwork Replacement	$2,500 – $12,200	required	Cost·Permit
Mini Split Installation	$2,400 – $12,700	required	Cost·Permit
Flooring Installation	$2,500 – $20,200	rarely required	Cost·Permit
Tile Installation	$1,800 – $16,100	rarely required	Cost·Permit
Interior Painting	$1,500 – $9,500	rarely required	Cost·Permit
Exterior Painting	$2,800 – $15,100	rarely required	Cost·Permit
Drywall Repair	$400 – $4,500	rarely required	Cost·Permit
Kitchen Cabinet Refacing	$4,500 – $20,100	rarely required	Cost·Permit
Countertop Replacement	$2,200 – $12,100	rarely required	Cost·Permit
Tub to Shower Conversion	$3,500 – $16,100	usually required	Cost·Permit
Sod Installation	$900 – $7,100	rarely required	Cost·Permit
Irrigation System Installation	$2,200 – $10,100	conditional	Cost·Permit
Tree Removal	$500 – $5,500	conditional	Cost·Permit
Outdoor Kitchen	$6,100 – $45,500	usually required	Cost·Permit
Seawall Repair	$8,100 – $96,200	required	Cost·Permit
Dock Construction	$9,100 – $86,100	required	Cost·Permit
Well Installation	$5,600 – $25,300	required	Cost·Permit
Mold Remediation	$1,500 – $15,100	conditional	Cost·Permit
Water Softener Installation	$1,200 – $6,600	usually required	Cost·Permit
Home Addition	$45,600 – $283,900	required	Cost·Permit
Heat Pump Replacement	$6,600 – $22,300	required	Cost·Permit
Furnace Replacement	$3,200 – $11,600	required	Cost·Permit
Foundation Repair	$2,800 – $32,300	usually required	Cost·Permit
Basement Waterproofing	$3,000 – $18,200	conditional	Cost·Permit
Drain Field Replacement	$6,100 – $25,300	required	Cost·Permit
Toilet Installation	$300 – $1,100	rarely required	Cost·Permit
Hot Tub Installation	$5,600 – $22,200	usually required	Cost·Permit

Missoula permitting basics

Jurisdiction	Missoula, Missoula County
Building department	Confirm with the city or county
Permit portal	No verified online portal on file
Owner-builder permits	Owner-builder permits common
Contractor verification	Verify any license with Montana Building Codes Bureau before signing

Sources

Sources & verification

Montana Building Codes Bureau

Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.